Android显示提示信息，实现两个界面之间的跳转

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1.新建一个Android工程，然后新建一个Android activity，整体目录如图所示：

2.activity_main.xml里面的代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="200sp"        android:layout_height="200sp"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:gravity="center"        android:text="第一个界面"        android:textSize="30sp" />    <Button        android:id="@+id/button1"        android:layout_width="100sp"        android:layout_height="100sp"        android:layout_below="@+id/textView1"        android:layout_centerHorizontal="true"        android:layout_marginTop="67dp"        android:text="跳转" /></RelativeLayout>

3.acvitity_second.xml里面的代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".SecondActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="200sp"        android:layout_height="200sp"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:gravity="center"        android:text="第二个界面"        android:textSize="30sp" />    <Button        android:id="@+id/button1"        android:layout_width="100sp"        android:layout_height="100sp"        android:layout_below="@+id/textView1"        android:layout_centerHorizontal="true"        android:layout_marginTop="67dp"        android:text="跳转" /></RelativeLayout>

4.MainActivity.java的代码如下所示：

package com.example.haha;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private Button button1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button1 = (Button) findViewById(R.id.button1);button1.setOnClickListener(this);}public void onClick(View v) {if (v.getId() == R.id.button1) {Toast.makeText(getApplicationContext(), "正在跳转", 0).show();Intent intent = new Intent(MainActivity.this, SecondActivity.class);startActivity(intent);}}}

5.SecondActivity.java的代码如下所示：

package com.example.haha;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class SecondActivity extends Activity implements OnClickListener {private Button button1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);button1 = (Button) findViewById(R.id.button1);button1.setOnClickListener(this);}public void onClick(View v) {if (v.getId() == R.id.button1) {Toast.makeText(getApplicationContext(), "跳转到第一个页面", 0).show();Intent intent = new Intent(SecondActivity.this, MainActivity.class);startActivity(intent);}}}

6.我的AndroidManifest.xml里面的代码如下所示：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.haha"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="4"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.haha.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name="com.example.haha.SecondActivity"            android:label="@string/title_activity_second" >        </activity>    </application></manifest>

7.运行可以实现两个界面之间的相互跳转，并且显示提示信息，代码下载地址：http://download.csdn.net/download/qq_29656961/9978021。

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